# CVE-2026-72290: KVM: s390: pci: Fix GISC refcount leak on AIF enable failure

Status: published. Published: 2026-08-15. Updated: 2026-11-06.

In the Linux kernel, the following vulnerability has been resolved:

KVM: s390: pci: Fix GISC refcount leak on AIF enable failure

kvm_s390_gisc_register() registers the guest ISC before pinning
the guest interrupt forwarding pages and allocating the AISB bit.
If any of the later setup steps fails, the function unwinds the
pinned pages and other local state, but does not unregister the
GISC reference. Add the missing kvm_s390_gisc_unregister() to the
error unwind path.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc; < 3882224b0e714f34de91e5f28307c5d3fccfe8f8 (affected, git); ≥ 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc; < 6e69317cd44a2f21f8f7a9d93eb3220e868adfa8 (affected, git); ≥ 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc; < 6cd6e1c978784eec9032e2fe94a53e62b674fe3e (affected, git); ≥ 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc; < 5fb75c5272950b3ebe8bdee7abfdafd44f38313b (affected, git); ≥ 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc; < adce12bb0e0dc82d1d6f0821c9faee3145e62a6f (affected, git); ≥ 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc; < 7b69729046a4c58f4cb457184e5ac4aaa179bff4 (affected, git). Source: CNA: Linux
- Linux / Linux: 6.0 (affected); ≥ 0; < 6.0 (unaffected, semver); ≥ 6.1.178; ≤ 6.1.* (unaffected, semver); ≥ 6.6.145; ≤ 6.6.* (unaffected, semver); ≥ 6.12.97; ≤ 6.12.* (unaffected, semver); ≥ 6.18.40; ≤ 6.18.* (unaffected, semver); ≥ 7.1.5; ≤ 7.1.* (unaffected, semver); ≥ 7.2; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.21% as of 2026-11-06; percentile 11.90%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/3882224b0e714f34de91e5f28307c5d3fccfe8f8 (CNA: Linux)

- https://git.kernel.org/stable/c/6e69317cd44a2f21f8f7a9d93eb3220e868adfa8 (CNA: Linux)

- https://git.kernel.org/stable/c/6cd6e1c978784eec9032e2fe94a53e62b674fe3e (CNA: Linux)

- https://git.kernel.org/stable/c/5fb75c5272950b3ebe8bdee7abfdafd44f38313b (CNA: Linux)

- https://git.kernel.org/stable/c/adce12bb0e0dc82d1d6f0821c9faee3145e62a6f (CNA: Linux)

- https://git.kernel.org/stable/c/7b69729046a4c58f4cb457184e5ac4aaa179bff4 (CNA: Linux)

- https://git.kernel.org/stable/c/3882224b0e714f34de91e5f28307c5d3fccfe8f8 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/5fb75c5272950b3ebe8bdee7abfdafd44f38313b (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/6cd6e1c978784eec9032e2fe94a53e62b674fe3e (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/6e69317cd44a2f21f8f7a9d93eb3220e868adfa8 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7b69729046a4c58f4cb457184e5ac4aaa179bff4 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/adce12bb0e0dc82d1d6f0821c9faee3145e62a6f (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-72290; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72290; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-72290; retrieved 2026-11-06; source updated Not reported

Revision: 04833e5069598708ae62948a00f29955f4afe9c148bb672269b1d0d40d1043f5

Canonical: https://y2.dev/cve/CVE-2026-72290

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